Answer:
The value of solubility product of barium sulfate is [tex] 3.09\times 10^{-6}[/tex].
Explanation:
[tex]BaSO_4\rightarrow Ba^{2+}+SO_4^{2-}[/tex]
S S
1 mole of barium sulfate dissociates into 1 mole of barium ion and one mole sulfate ion.
So, [tex][Ba^{2+}]=[SO_4^{2-}]=S[/tex]
[tex][Ba^{2+}]=S=1.76\times 10^{-3} M[/tex]
The solubility product the barium sulfate will be given by:
[tex]K_{sp}=S\times S=S^2[/tex]
[tex]K_{sp}= (1.76\times 10^{-3})^2=3.09\times 10^{-6}[/tex]
The value of solubility product of barium sulfate is [tex] 3.09\times 10^{-6}[/tex].
Which term describes the sum of the number of protons and neutrons in an atom?
Answer: The term is Mass number.
Explanation:
Atomic number is defined as the number of protons or number of electrons present in an atom. It is represented as Z.
Z = Number of protons = Number of electrons
Mass number is defined as the sum of number of protons and neutrons in an atom. It is represented as A.
A = Number of proton + Number of neutrons
Hence, the correct answer is Mass number.
based on the nebular Theory, which of these is a step in the formation of a new planetary system?
A) evaporation of water
B) nuclear fission of gases
C) repulsion of gaseous masses
D) change of gases into liquids
Final answer:
The formation of a new planetary system involves the condensation of solid particles, accretion and collision of planetesimals, and the formation of protoplanets.
Explanation:
The formation of a new planetary system according to the nebular theory involves several steps. One important step is the condensation of solid particles from the solar nebula, which leads to the formation of planetesimals. The planetesimals then continue to accrete and collide with each other, gradually growing in size. This process eventually results in the formation of protoplanets, which are still in the process of forming into fully developed planets. Therefore, the correct answer is C) repulsion of gaseous masses.
You are given 450.0 g of a 0.7500 molal solution of acetone dissolved in water. how many grams of acetone are in this amount of solution?
To find the grams of acetone in the given solution, we can use the formula for molality and calculate the mass of acetone based on the molality, molar mass of acetone, and mass of the solvent.
Explanation:The mass of the solution is given as 450.0 g and the molality is given as 0.7500 molal. To find the grams of acetone in the solution, we can use the formula for molality:
Molality (m) = moles of solute / mass of solvent (in kg)
Since 0.7500 molal corresponds to 0.7500 mol of acetone per 1 kg of water, we can calculate the mass of acetone by multiplying the molality by the molar mass of acetone and the mass of the solvent:
Mass of acetone = 0.7500 molal * (58.08 g/mol) * (0.4500 kg)
Therefore, there are 22.52 grams of acetone in this amount of solution.
Which of the following best predicts the outcome of a fusion reaction involving isotopes of hydrogen?
Two hydrogen isotopes form bonds with each other, absorbing a large amount of energy.
The nuclei of the hydrogen isotopes join together to form a heavier element, and energy is released.
Isotopes of hydrogen absorb electrons, undergo an increase in energy level, and split into fragments.
The nuclei of the hydrogen isotopes split, resulting in smaller fragments and the release of a large amount of energy.
Which structure shows the correct electron arrangement in CCl4?
Answer : The figure is attached in the attachment.
Explanation : The central atom will be carbon to which at 109.8 degrees will be each chlorine atoms. And the central carbon atom is [tex] SP^{3}[/tex] hybridized. There will be four chlorine atom surrounding the central carbon atom. There will be 3 lone pairs of electron on each of the chlorine atom which gets attached with carbon atom.
The Lewis structure shows the electrons in a molecule.
The Lewis structure of a molecule shows the number of electrons in the molecule. The unshared electrons are shown as dots while the shared electrons may be showed as a single dash.
The correct Lewis structure of CCl4 is shown in the image attached to this answer.
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what conclusion did rutherford draw from this experiment?
From his experiments, Rutherford deduced two main conclusions: first, the majority of an atom's space is empty, and second, the alpha particles' drastic deflections were due to a highly concentrated, positive charge, i.e., the atomic nucleus. The nucleus, according to Rutherford, is 100,000 times smaller than the atom.
Explanation:Ernest Rutherford, after conducting multiple experimental runs, arrived at two conclusions with respect to the internal structure of atoms:
Most of the atom's space is essentially empty, evidenced by the fact that the majority of fast-moving alpha particles passed through the gold atoms undeflected.A small portion of the alpha particles deflected drastically, implying that they had encountered a highly concentrated, positive charge within a small fraction of the atom's space. This was interpreted as the atomic nucleus.Rutherford's theory suggested that the nucleus was about 10-15 m in size, which made it 100,000 times smaller than the atom itself. The experiment had a profound impact on the field of Physics, leading Rutherford to propose that nearly all the mass of atoms is concentrated in their nucleus. This revolutionary understanding significantly altered the then-existing atomic model and paved the way for a deeper understanding of atomic structure.
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Consider the incomplete reaction below.
NaOH + X mc005-1.jpg NaCH3COO + H2O
What is X in this reaction?
NH4OH
H3PO4
H2CO3
CH3COOH
In the given neutralization reaction, X would be CH₃COOH.
Let's consider the incomplete reaction below.
NaOH + X ⇒ NaCH₃COO + H₂O
This seems to be a neutralization reaction.
What is a neutralization reaction?It is a reaction between an acid and a base to form salt and water.
We can identify:
Acid: XBase: NaOHSalt: NaCH₃COOWater: H₂OWhat is X in this reaction?
NH₄OH. No, because it is not an acid.H₃PO₄. No, because it wouldn't form NaCH₃COO. H₂CO₃. No, because it wouldn't form NaCH₃COO.CH₃COOH. Yes.In the given neutralization reaction, X would be CH₃COOH.
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In a voltaic cell, where does the reduction take place?
Answer : The reduction reaction takes place at cathode.
Explanation :
Voltaic cell : It is defined as a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.
In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.
For example : The redox reaction occurs between the zinc and copper sulfate.
The balanced two-half reactions will be,
Oxidation half reaction (cathode) : [tex]Zn(s)\rightarrow Zn^{2+}(aq)+2e^-[/tex]
Reduction half reaction (anode) : [tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex]
Thus the overall reaction will be,
[tex]Zn(s)+Cu^{2+}(aq)\rightarrow Zn^{2+}(aq)+Cu(s)[/tex]
Hence, the reduction reaction takes place at cathode.
a common greenhouse gas containing only hydrogen and oxygen
Can someone help mee, pls show the works.. Thx
Answer:
6.6 moles of CO2 is produced
Explanation:
97 g of C3H8 is equal to 2.2 moles, so we'll use ratio method according to which for 97 g of C3H8 6.6 moles of CO2 is produced
How many electrons potassium isotope with 19 protons and 22 neutrons?
When fast moving electrons are released from an atom by way of a beta particle, the atom ends up with...
one less proton and one more neutron.
one more proton and one less neutron.
the same number of protons and two more neutrons.
two more neutrons and the same number of protons.
According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases:
the number of particle impacts per unit area increases
the temperature must change
the total number of particle impacts increase
the number of particle impacts per unit area decreases
The Kinetic Molecular Theory suggests that as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases since the gas particles are more spread out.
Explanation:According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases. The Kinetic Molecular Theory, a fundamental concept in gas physics, postulates that gas particles are in constant, random motion and that they frequently collide with each other and the walls of their container. When the volume of the container increases, the gas particles have more space to move around, the number of possible collision points increase but relatively the collisions with specific unit area decreases as the particles are more spread out. So the number of particle impacts per unit area decreases, not increases. The total number of particle impacts or the temperature does not necessarily have to change.
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Which statement correctly describes an electrode in a voltaic cell of copper and hydrogen?
A. Copper atoms become copper ions at the anode because the SRP is more positive.
B. Hydrogen ions become diatomic hydrogen at the cathode because hydrogen is always reduced in a voltaic cell.
C. Copper ions become copper atoms at the cathode because copper is always reduced in a voltaic cell.
D. Diatomic hydrogen becomes hydrogen ions at the anode because the SRP is more negative.
The two naturally occurring isotopes of copper are copper-63 and copper-65. how many neutrons are in one atom of copper-65? 29 34 36 65
Answer: The number of neutrons in copper-65 are 36.
Explanation:
Atomic number is defined as the number of protons that are present in an atom. It is represented as 'Z'
Z = Atomic number = Number of protons
Atomic mass of an element is defined as the sum of number of neutrons and number of protons that are present in an atom. It is represented as 'A'.
A = Atomic mass = Number of neutrons + Number of protons
For Copper, the atomic number is 29.
We are given:
Atomic mass of copper-65 = 65
Number of neutrons = 65 - 29 = 36
Hence, the number of neutrons in the given isotope of copper are 36.
The density of a gas is 1.49 g/l at a temperature of 24 âc and a pressure of 0.787 atm . calculate the molar mass of the gas.
The molar mass of the gas is approximately [tex]47.56 \text{ g/mol}[/tex]
To calculate the molar mass of the gas, we can use the Ideal Gas Law, which is given by:
[tex]\[ PV = nRT \][/tex]
where:
- [tex]\( P \)[/tex] is the pressure of the gas,
- [tex]\( V \)[/tex] is the volume of the gas,
- [tex]\( n \)[/tex] is the number of moles of the gas,
- [tex]\( R \)[/tex] is the ideal gas constant, and
- [tex]\( T \)[/tex] is the temperature of the gas in Kelvin.
First, need to convert the temperature from Celsius to Kelvin:
[tex]\[ T(K) = T(\°C) + 273.15 \] \[ T(K) = 24 + 273.15 = 297.15 K \][/tex]
The density [tex]\( \rho \)[/tex] of the gas is given as 1.49 g/L. The density is the mass [tex]\( m \)[/tex] divided by the volume [tex]\( V \)[/tex]:
[tex]\[ \rho = \frac{m}{V} \][/tex]
express the mass in terms of the molar mass [tex]\( M \)[/tex] and the number of moles [tex]\( n \)[/tex]:
[tex]\[ m = M \cdot n \][/tex]
Substituting this into the density equation gives:
[tex]\[ \rho = \frac{M \cdot n}{V} \][/tex]
Now, can rearrange the Ideal Gas Law to solve for [tex]\( n \)[/tex]:
[tex]\[ n = \frac{PV}{RT} \][/tex]
Substituting this expression for [tex]\( n \)[/tex] into the density equation gives:
[tex]\[ \rho = \frac{M \cdot PV}{RTV} \][/tex]
[tex]\[ \rho = \frac{M \cdot P}{RT} \][/tex]
Now, can solve for the molar mass [tex]\( M \)[/tex]:
[tex]\[ M = \frac{\rho RT}{P} \][/tex]
know that the ideal gas constant [tex]\( R \)[/tex] is 0.0821 L·atm/(mol·K), so we can plug in the values:
[tex]\[ M = \frac{1.49 \text{ g/L} \cdot 0.0821 \text{ L\·atm/(mol\·K)} \cdot 297.15 \text{ K}}{0.787 \text{ atm}} \] \[ M = \frac{1.49 \cdot 0.0821 \cdot 297.15}{0.787} \] \[ M = \frac{37.41}{0.787} \] \[ M \approx 47.56 \text{ g/mol} \][/tex]
Therefore, the molar mass of the gas is approximately 47.56 g/mol.
How many n2o4 molecules are contained in 76.3 g n2o4? the molar mass of n2o4 is 92.02 g/mol?
Answer:[tex]4.98\times 10^{23}[/tex] molecules
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{76.3g}{92.02g/mol}=0.83 moles[/tex]
1 mole of [tex]N_2O_4[/tex] contains =[tex]6.023\times 10^{23}[/tex] molecules
0.83 moles of [tex]N_2O_4[/tex] contains =[tex]\frac{6.023\times 10^{23}}{1}\times 0.83=4.98\times 10^{23}[/tex] molecules
Thus total number of molecules in 76.3 g of [tex]N_2O_4[/tex] is [tex]4.98\times 10^{23}[/tex] molecules
Taking into account the definition of molar mass and Avogadro's number, 4.99×10²³ molecules are contained in 76.3 g of N₂O₄.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Moles that contain 76.3 g of N₂O₄Being the molar mass of N₂O₄ is 92.02 g/mol, you can apply the following rule of three: If by definition of molar mass 92.02 grams of the compound are contained in 1 mole, 76.3 grams are contained in how many moles?
[tex]amount of moles=\frac{76.3 gramsx1 mole}{92.02 grams}[/tex]
amount of moles= 0.829 moles
Molecules contauned in 0.829 moles of N₂O₄Then you can apply the following rule of three: If by definition of Avogadro's number, 1 mole of the compound contains 6.023×10²³ molecules, 0.829 moles contains how many molecules?
amount of molecules= (6.023×10²³ molecules× 0.829 moles)÷ 1 mole
amount of molecules= 4.99×10²³ molecules
Finally, 4.99×10²³ molecules are contained in 76.3 g of N₂O₄.
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Convert 3.45 kilometers to micrometers.
3.45= 3,450,000,000 Im working on this at school rn I hope I helped
Calcium chloride (cacl2) is an ionic compound that dissociates in water. a chemist forms a solution by mixing 0.50 mol cacl2 and 1.0 kg of water. how many moles of ions are in the solution?
Calcium chloride (CaCl2) is a salt which dissociates when dissolved in water. Assuming that the dissociation is complete (100 %), then the half reaction for this would be:
CaCl2 ---> Ca2+ + 2 Cl-
We can see that in 1 mole of CaCl2 salt, 1 mole of Ca2+ ion and 2 moles of Cl- ion is created. Therefore there are 3 moles of ion per 1 mole of CaCl2. Using this ratio, the total number of moles of ions in the solution is:
Total number of ions = 0.5 mol CaCl2 * (3 moles ion / 1 mol CaCl2)
Total number of ions = 1.5 moles ion
Answer:
1.5 mol ions
Explanation:
Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and acetic acid ch3cooh , the main ingredient of vinegar. what mass of ethanol is consumed by the reaction of 3.84g of oxygen gas? be sure your answer has the correct number of significant digits.
Calculate the molarity of a solution containing 0.2 mol nh4br in exactly 200 ml solution
Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. Please, do not answer it fully but please explain it out and help me understand! thank you
How many carbon atoms are found in a molecule of 2-methyl-3-nonene? 8 9 10 11
The solubility product for barium sulfate is 1.1 × 10–10. calculate the molar solubility of barium sulfate.
the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.
The correct option is (b).
The solubility product (Ksp) for Barium Sulfate (BaSO₄) is given as 1.1 × 10⁻¹⁰. The solubility product is the equilibrium constant representing the relationship between the concentrations of the ions in the saturated solution:
BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq)
To calculate the molar solubility (S) for BaSO₄, we need to find the concentration of Ba²⁺ and SO₄²⁻ ions at equilibrium. Since Ksp is given, we can use the definition of the solubility product:
Ksp = [Ba²⁺] × [SO₄²⁻]²
We don't have the individual ion concentrations but can find the total molar solubility (Sₙ) by taking the square root of the solubility product:
Sₙ = √(Ksp) = √(1.1 × 10⁻¹⁰) = 1.05 × 10⁻⁵ mol/L
So, the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.
complete question given below:
The solubility product for barium sulfate is 1.1*10⁻¹⁰. Calculate the molar solubility of barium sulfate.
1) 5.5*10⁻⁸ mol/L
2) 1.05 *10⁻⁵ mol/L
3) 2.1*10⁻⁵ mol/L
4) 1.1*10⁻¹⁰ mol/L
5) 2.2*10⁻¹⁰ mol/L
A solution is prepared by dissolving 16.2 g of benzene (c6h6) in 282 g of carbon tetrachloride (ccl4). the concentration of benzene in this solution is ________ molal. the molar masses of c6h6 and ccl4 are 78.1 g/mol and 154 g/mol, respectively.
Answer:
43.7%
Explanation:
What is the mass of 4.91 x10^21 platinum atoms?
To calculate the mass, go from atoms to moles and moles to grams:
Atoms ........ Moles.......... Grams
From atoms to moles, use the Avogadro’s no. which is 6.022 x 10^23 and from moles to grams use atomic mass of Pt that is 195.08g.
So, 4.91 x 10^21 Pt atoms x (1 mole Pt / 6.022x10^23 Pt atoms) x (195.08g Pt / 1 mole Pt) = 1.59g Pt
Mass of 4.91 x 10^21 Pt atoms = 1.59g Pt
The mass of [tex]4.91 \times {10^{21}}{\text{ platinum atoms}}[/tex] is [tex]\boxed{1.59{\text{ g}}}[/tex].
Further Explanation:
We are provided with atoms of platinum and its mass is to be calculated. For this, first of all atoms of Pt are to be converted into moles. This is done with the help of Avogadro’s law. According to Avogadro’s law, one mole of any substance contains [tex]6.022 \times {10^{23}}{\text{ units}}[/tex]. Such units can be atoms and molecules.
Since [tex]6.022 \times {10^{23}}[/tex] of platinum consist of one mole, number of moles that are present in [tex]4.91 \times {10^{21}}{\text{ atoms}}[/tex] can be calculated as follows:
[tex]\begin{aligned}{\text{Moles of Pt}} &= \left( {4.91 \times {{10}^{21}}{\text{ atoms}}} \right)\left( {\frac{{1{\text{ mol}}}}{{6.022 \times {{10}^{23}}{\text{ atoms}}}}} \right) \\&= 0.008153{\text{ mol}} \\\end{aligned}[/tex]
Now moles calculated in above step are used to proceed for further calculations of mass. Moles and mass of Pt are related to each other with the help of expression written below.
The formula to calculate moles of Pt is as follows:
[tex]{\text{Moles of Pt}} = \dfrac{{{\text{Mass of Pt}}}}{{{\text{Molar mass of Pt}}}}[/tex] ……(1)
Rearrange equation (1) to calculate mass of Pt.
[tex]{\text{Mass of Pt}} = \left( {{\text{Moles of Pt}}} \right)\left( {{\text{Molar mass of Pt}}} \right)[/tex] …… (2)
The moles of Pt are0.008153 mol.
The molar mass of Pt is 195.084 g/mol.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{Mass of Pt}} &= \left( {{\text{0}}{\text{.008153 mol}}} \right)\left( {{\text{195}}{\text{.084 g/mol}}} \right)\\&= 1.59{\text{ g}} \\\end{aligned}[/tex]
Hence,mass of platinum comes out to be 1.59 g.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Mole concept
Keywords: mole, atoms, Pt, platinum, moles of Pt, molar mass of Pt, 1.59 g, Avogadro’s law, 6.022*10^23 atoms, 4.91*10^21 atoms, mass of Pt, 195.084 g/mol, 0.008153 mol, mass of platinum.
What is the first step in the refining of petroleum?
Answer:
the first step is distillation
Explanation:
If you are given a 1.0 L (1000mL) of an unknown liquid which has the mass of 500 grams it is most likely which of the above substances? Show work to back up your answer. Distilled water density 1.0 g/cm^3 propane density 0.494 g/cm^3 salt water density 1.025 g/cm^3 liquid gold density 17.31g/cm^3
A hurricane track gives the probability of a hurricane following a specific path. What type of scientific model is this?
H2O has a Hvap = 40.7 kJ/mol. What is the quantity of heat that is released when 27.9 g of H2O condenses?
Answer:
Quantity of heat released = -63.1 kJ
Explanation:
Given:
Enthalpy of vaporization of water, ΔHvap = 40.7 kJ/mol
Mass of water, m = 27.9 g
To determine:
The amount of heat (Q) released
Explanation:
The reaction is: H2O(g) ↔ H2O(l)
The amount of heat evolved during condensation which involves a phase transition from vapor to liquid is given as:
[tex]Q = n*\-Delta Hvap[/tex]
n = moles of water
Since this is a condensation process: ΔHcond = -ΔHvap
[tex]Q = \frac{27.9 g}{18 g/mol} * -40.7 kJ/mol = -63.1 kJ[/tex]